“This is a homicide- make no mistake about it. We just don’t know how many homicides,” Weintraub said.

Cosmo DiNardo, 20, is being called a “person of interest” in the case.

Photo provided by the Bucks County District Attorney’s Office in Doylestown, Pa.

His parents own the farm where the the grisly discovery was made.

The FBI is using heavy equipment to dig a deep ditch on the farm property, and then sifting through each bucket of dirt by hand to search for clues and remains.

DiNardo initially had been arrested on Monday and held on $1 million bail on a gun charge, before his father paid $100,000 to bail him out on Tuesday. DiNardo was busted with a shotgun and ammunition despite a prior mental health problem.

But DiNardo was arrested Wednesday for allegedly trying to sell Meo’s car for $500 on July 9 — a day after Meo was last seen. That 1996 Nissan Maxima was also found on the family’s farm, which is about 30 miles north of Philadelphia.

DiNardo is being held on $5 million cash bail.

Weintraub said police would “continue digging and searching that property until we’re satisfied that they are not there.”

“This is just really, really rough on everybody involved because of the heat, the magnitude, the scope — and the stakes are incredibly high — life and death,” he said.